Bulb size & fitment reference

2003 Chevrolet Silverado 2500 HD
Bulb Size Guide

Get the bulb-size answer first, then check factory-system differences and position-specific notes before buying.

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Quick Answer

Start with the positions you’re most likely to replace. Full fitment details are below.

Low Beam

9006 / HB4

Shop this position →

High Beam

9005 / HB3

Shop this position →

Fog Light

9145 / H10

Shop this position →

Turn Signal

3157 / 3156

Shop this position →

Full Bulb Fitment by Lighting Position

Find the bulb size for each lighting position and check any fitment notes before ordering.
Lighting PositionBulb SizeNoteNext Step
High Beam9005 / HB3Shop position →
Low Beam9006 / HB4Shop position →
Fog Light9145 / H10Shop position →
Daytime Running Light3157 / 3156Shop position →
Front Turn Signal3157 / 3156Shop position →
Parking Light3157 / 3156Shop position →
Rear Turn Signal3157 / 3156Shop position →
Brake Light3157 / 3156Shop position →
Center High Mount Stop Light912 / 921 / T15Shop position →
Tail Light3157 / 3156Shop position →
Reverse Light3157 / 3156Shop position →
License Plate LightT10 / 194 / 168Shop position →
Front Side Marker LightT10 / 194 / 168Shop position →
Rear Side Marker LightT10 / 194 / 168Shop position →
Side Marker LightT10 / 194 / 168Shop position →
Dome Light211-2 / 578 / 41MMShop position →
Map LightT10 / 194 / 168Shop position →
Courtesy LightT10 / 194 / 168Shop position →
Glove Box LightT10 / 194 / 168Shop position →
Ash Tray LightT10 / 194 / 168Shop position →
Stepwell LightT10 / 194 / 168Shop position →
Luggage Compartment Light912 / 921 / T15Shop position →
Engine Compartment Light1156 / BA15SShop position →
Fitment Reminder
Bulb size can vary by factory setup. If you're unsure which option applies to your vehicle, confirm your current bulb or select your configuration on the product page. View Fitment Options →

Installation Help

Step-by-step guidance for installing compatible lighting on your vehicle.Step-by-step installation guidance

View installation help →View guide →

Replacing Multiple Bulbs?

Upgrade multiple lighting positions together with our lighting kit builder.Build your lighting kit.

Build a Lighting Kit →Build a Lighting Kit →

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Browse compatible lighting, upgrades, and guides.

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